Leetcode Problem 545. Boundary of Binary Tree

545. Boundary of Binary Tree

Leetcode Solutions

Start with the root node and add it to the result list.
Traverse the left boundary and add nodes to the result list, excluding the leftmost leaf.
Perform an in-order traversal to collect all the leaf nodes and add them to the result list.
Traverse the right boundary and add nodes to a temporary list, excluding the rightmost leaf.
Reverse the temporary list of right boundary nodes and add them to the result list.
Return the result list containing the boundary of the binary tree.

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